All categories

3 years ago

How do Archaeologists use fossils?

2 answers:

mihalych1998 [28]3 years ago

5 0

An archaeologist has to know the difference between artifacts and fossils. (it’s important because archaeologists don’t look for fossils) fossils are the remains of living things (people, plants, animals)

STatiana [176]3 years ago

3 0

To learn about the beings of history

You might be interested in

Measure the initial temperature of the water to the nearest 0.1°C. Record in the data table.

Aleksandr [31]

Answer:

Explanation:

8 0

3 years ago

Determine whether each of the following is a strong acid, a weak acid, or a species with negligible acidity.Drag the appropriate

sp2606 [1]

Answer:

CH₃NH₃⁺ is a weak acid.

HPO₄²⁻ has a negligible acidity.

CH₄ has a negligible acidity.

HNO₂ is a weak acid.

Explanation:

There are 7 strong acids: HCl, HBr, HI, HNO₃, H₂SO₄, HClO₃, HClO₄. The rest of the acids are weak.

CH₃NH₃⁺ is a weak acid, according to the following equation:

CH₃NH₃⁺ ⇄ CH₃NH₂ + H⁺

HPO₄²⁻ can act as an acid or as a base:

Acid reaction: HPO₄²⁻ ⇄ PO₄³⁻ + H⁺

Basic reaction: HPO₄² + H₂O ⇄ H₂PO₄⁻ + OH⁻

Given Kb > Ka, HPO₄²⁻ has a negligible acidity.

CH₄ cannot release nor accept H⁺ so it has a negligible acidity.

HNO₂ is a weak acid, according to the following reaction:

HNO₂ ⇄ H⁺ + NO₂⁻

7 0

3 years ago

Which of the following statements is true?

Darya [45]

Option A is the only answer here.

6 0

4 years ago

How is the rate of reaction influenced by a catalyst?

lawyer [7]

By providing an alternative reactionmechanism with a lower activation energy.

3 0

3 years ago

How many moles of ammonium sulfate can be from the reaction of 30.0 mol of NH3 with H2SO4 according to the following equation: 2

marysya [2.9K]

Answer:

15 moles of ammonium sulfate would be formed from 30 moles of ammonia.

Explanation:

Given data:

Number of moles of ammonium sulfate formed = ?

Number of moles of ammonia = 30.0 mol

Solution:

Chemical equation:

2NH₃ + H₂SO₄ → (NH₄)₂SO₄

Now we will compare the moles of ammonium sulfate with ammonia.

NH₃ : (NH₄)₂SO₄

2 : 1

30.0 : 1/2×30.0 = 15.0 mol

So 15 moles of ammonium sulfate would be formed from 30 moles of ammonia.

7 0

3 years ago